Oxidation Behavior of Titanium Alloys
Summary
Titanium alloys exhibit a strong affinity for oxygen, leading to the formation of oxide layers when exposed to elevated temperatures. The primary protective oxide is rutile TiO₂, which may develop as a compact, adherent scale that impedes further oxygen ingress. Under certain conditions—high temperature, prolonged exposure or unfavourable alloy compositions—this protective layer can break away, resulting in rapid scale growth and subsurface oxygen enrichment known as the “alpha-case”. The thickness, morphology and composition of oxide scales are governed by diffusion kinetics, alloying elements and phase constitution (α, β or near-α structures). Alloying additions such as Cr, Al or Si can modify oxide adherence and growth rates by changing diffusion pathways or by stabilising secondary oxides. The interplay of microstructure, temperature and mechanical loading at the oxide–metal interface is of global importance for aerospace turbine components, power-generation equipment and chemical-processing reactors where both high strength and oxidation resistance are critical.
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Oxidation Behavior of Titanium Alloys publication trend
The graph below shows the total number of articles in oxidation behavior of titanium alloys across all publications each year (not limited to Nature Index journals).
Technical terms
Alpha-case: A hardened, oxygen-rich subsurface layer formed beneath the oxide scale during high-temperature exposure.
Parabolic kinetics: Oxide growth regime where scale thickness increases proportionally to the square root of time, indicating diffusion-controlled processes.
Near-α alloy: Titanium alloy whose microstructure comprises predominantly α phase with limited β phase, offering high creep resistance at elevated temperatures.
Oxide scale: The multi-layered ceramic film formed on a metal surface during oxidation, typically composed of distinct sublayers with varying compositions and structures.
Additive manufacturing (AM): Layer-wise fabrication process (e.g. electron beam melting) that can influence microstructure, residual stress and hence oxidation response.
References
- A new combinatorial approach to assess the influence of alloy composition on the oxidation behavior and concurrent oxygen-induced phase transformations for binary Ti–xCr alloys at 650°C. Corrosion Science (2015).
- Non-Isothermal Oxidation Behavior and Mechanism of a High Temperature Near-α Titanium Alloy. Materials (2018).
- Oxidation Kinetics of Ti-6Al-4V Alloys by Conventional and Electron Beam Additive Manufacturing. Materials (2023).
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